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Low-complexity and high-precision rapid dielectric loss angle measurement method

A dielectric loss angle, low-complexity technology, applied in dielectric performance measurement, measurement device, measurement of electrical variables, etc., to achieve the effect of simple implementation method, good stability, and easy hardware implementation

Inactive Publication Date: 2020-04-21
JISHOU UNIVERSITY
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  • Application Information

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Problems solved by technology

[0004] Technical problem: In view of the shortcomings of the current dielectric loss angle measurement method, the present invention proposes a low-complexity, high-precision rapid dielectric loss angle measurement method

Method used

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  • Low-complexity and high-precision rapid dielectric loss angle measurement method
  • Low-complexity and high-precision rapid dielectric loss angle measurement method
  • Low-complexity and high-precision rapid dielectric loss angle measurement method

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Embodiment approach

[0033] Obtain current and voltage signals from electrical equipment using current and voltage transformers:

[0034]

[0035]

[0036] Among them, m is the harmonic order, M is the total harmonic order, i m is the amplitude of the mth harmonic of the current signal, φ im is the phase of the mth harmonic of the current signal, u m is the amplitude of the mth harmonic of the voltage signal, φ um is the phase of the mth harmonic of the voltage signal, f 0 is the fundamental frequency. The corresponding output spectrum sequence {I(n)} is obtained after the Fourier transform of the current signal i(t), and the corresponding output spectrum sequence {U(n) is obtained after the Fourier transform of the voltage signal u(t). }. Due to factors such as non-synchronous sampling, when the signal is directly processed by Fourier transform, there will be serious spectrum leakage near the unreal frequency, which limits the improvement of parameter measurement accuracy. In order to ...

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Abstract

The invention relates to a low-complexity and high-precision rapid dielectric loss angle measurement method. The method comprises the following steps: firstly, carrying out fast Fourier transform (FFT) on current and voltage signals to obtain a corresponding spectrum sequence; converting an original current signal spectrum sequence and a voltage signal spectrum sequence by using a sequence conversion formula to obtain a new spectrum sequence; and then, obtaining estimated values of fundamental phase angles of the corresponding current and voltage signals by utilizing the new current and voltage spectrum sequences, and calculating a dielectric loss angle by utilizing the estimated values of the current and voltage phases on the basis of the estimated values. An influence of spectrum leakageon dielectric loss angle measurement precision can be effectively overcome, the measurement precision is higher than that of a classic dielectric loss angle measurement method, and an implementationmethod is simple, low in calculation complexity and convenient for hardware implementation.

Description

technical field [0001] The invention relates to a low-complexity and high-precision fast dielectric loss angle measurement method, which belongs to the field of smart grid signal processing. Background technique [0002] The rapid development of the power system has led to a rapid increase in the load of the power grid, thereby continuously expanding the scale of the power grid. Therefore, the reliability and operation status of equipment directly affect the stability and safety of the entire system. Many of the equipment failures are caused by equipment insulation problems, so the monitoring of equipment insulation status has become a key issue for the safe operation of the power grid system. The dielectric loss angle δ is an important parameter to measure the insulation state of the equipment, so the high-precision measurement of the dielectric loss angle has important practical application value. [0003] The digital measurement methods of dielectric loss angle mainly in...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26
CPCG01R27/2694
Inventor 雷可君汪旭明杨喜张仁民张银行
Owner JISHOU UNIVERSITY